I think many factors have to be taken into consideration when a system like the BMI measures a person's weight. These factors include, but not limited to, the bone mass and structure, muscles mass, and the variety of weight scales in the market. In other words, two people who have the same height, weight and, as a result, BMI might differ in their health and body figures which shows whether someone is visually overweight or not.
Hence, is there any better measurement to accurately calculate the weight someone has to lose or even gain ?
p.s. I'm new here